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Abstract

Timed artificial insemination (AI) programs have increased reproductive efficiency in dairy herds. A low timed AI pregnancy per AI is partially explained by cows that fail to respond optimally to the series of treatments that are designed to synchronize ovulation for AI. We hypothesized that...

Author(s)
Wilsdorf, L. J.; Keisler, D. H.; Poock, S. E.; Lamberson, W. R.; Escalante, R. C.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 7, pp 5858-5865
Abstract

Different GnRH products are used for timed artificial insemination (AI) in postpartum dairy cows. Previous studies reported greater LH release and increased ovulation percentage for gonadorelin diacetate tetrahydrate compared with gonadorelin hydrochloride but pregnancies per AI (P/AI) were not...

Author(s)
Poock, S. E.; Lamberson, W. R.; Lucy, M. C.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2015, 84, 4, pp 504-508
Abstract

Progesterone-releasing (controlled internal drug release, CIDR) devices inserted for 14 d are used to presynchronize the estrous cycle for timed artificial insemination (TAI) in beef heifers (14-d CIDR-PGF program). The objective was to test a similar program in dairy cows by measuring...

Author(s)
Escalante, R. C.; Poock, S. E.; Mathew, D. J.; Martin, W. R.; Newsom, E. M.; Hamilton, S. A.; Pohler, K. G.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 1, pp 300-306
Abstract

Chemical pregnancy testing is an alternative to traditional methods of pregnancy diagnosis (either manual palpation or ultrasound) in postpartum dairy cows and heifers. The objective was to validate a chemical pregnancy test that confers the advantages of using whole blood, rapid incubation times,...

Author(s)
Mayo, L. M.; Moore, S. G.; Poock, S. E.; Silvia, W. J.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 9, pp 7634-7641
Abstract

Cattle that are not pregnant to first fixed-time artificial insemination (TAI) may be resynchronized for a second TAI if they are found nonpregnant at pregnancy diagnosis. The specific interval between first and second TAI ranges from 4 to 8 wk. The selected interval depends on the available method ...

Author(s)
Green, J. C.; Okamura, C. S.; Mathew, D. J.; Newsom, E. M.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 12, pp 5668-5672
Abstract

Progesterone-containing controlled internal drug release (CIDR) inserts are used to synchronize the estrous cycle before PGF is administered for timed AI (14dCIDR-PGF program). The program, initially designed for beef cattle, was recently shown to be efficacious in dairy heifers. We...

Author(s)
Escalante, R. C.; Poock, S. E.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 6, pp 3806-3816